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A US man has lived for a record 271 days with a transplanted pig kidney while awaiting a human organ, marking a milestone in xenotransplantation research. The case demonstrates continued progress in efforts to use genetically modified animal organs to address the shortage of human transplants. Doctors and researchers have been closely monitoring the patient's health as the longest-surviving recipient of a pig kidney, offering new data on the viability of cross-species organ transplantation as a bridge therapy for patients on transplant waiting lists.